Sewing-machine loop taker



Jan. 26 ,1926. 1,570,667

A. GRIEB SEWING MACHINE LOOP TAKER Filed Jan. 14. 1922 INVENTOR flew 5 WITNESSES Patented Jan. 26, 1926.

UNITED STATES JERSEY.

PATENT OFFICE.

ALFRED GRIEB, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANU- EACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW.

SEWING-MACHINE LOOP TAKER.

I Application filed January 14, 1922. Serial No; 529,112..

T all whom it may concern:

Be it known that I, ALFRED GRIEB, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machine Loop Takers, of which the following is a specification, reference being had therein to the accompanyingdrawings.

' This inventionrelates to sewing machine loop-takers generally, and more particularly to loop-takers of the rotary type adapted for cooperation with a reciprocating eyepointed needle to form stitches.

.Heretofore, it has been the usual custom to fashion a loop-taker of this character. from a solid piece of material, such as a drop forging; considerable time and effort being required to machine or finish such piece or forging to the requisite shape and size for efficient operation.

WVhile efiorts have been madeto fashion sewing v.machine loop-takers from sheetmetal blanks, such loop-takers have been unsatisfactory forthe reason that they were easily broken from their supports and were not so shaped as to control the needle-thread loop to the best advantage. Furthermore,

, with prior sheet-metal loop-takers, it has required painstaking care to center a looptaker on its support and to set the loop-taker body 'in correct'angular relation with the axisof rotation of the loop-taker support or shaft.

An object of the present invention is to provide a sheet-metalloop-taker which retains the advantages of strength, durability, and superior sewing qualities of the more expensive loop-takers fashioned from solid chunks of material or drop forgings, and which may be manufactured at low cost.

Further objects of the invention will appear from the following description and claims. r

' To the attainment of the ends in view, a sheet-metalblank of predetermined shape including bodyand ear portions, is so bent aslto disposethe ear portion in'a planeparallel to thepl'ane of action of 'the' loop-taker body. If the body-portion includes 'wing' and blade portions, as in the case of a looptaker or looper of the rotary chain-stitch type, the blade portion is twisted at an angle to the wing portion so as to lie substantially parallel to the plane of the ear portion. The line of fold between the ear and wing portions is preferably disposed at the side of the center of rotation of the looper, so that such center of rotation may belocated on the ear portion and marked with a hole, if so desired. l

' Ashank element is preferably turned out" of ordinary roundstock and may be formed with an enlarged disk-like head from the center of which projects a pin adapted to' enter the centering aperture in the ear portion of the looper. This pin may be swelled or headed over to secure the looper to its shank and an additional fastening may .be'

provided by riveting or spot welding the ear portion ofthe looper to the disk-likehead of its shank at a point spaced from the center of rotation. The-round shank may then be flattened along one side,'as usual,to insure the proper timing of'the looper when nlioiinted in the usual sewing machine loopers 1a t. I'

In the accompanying drawings, Fig. 1 is a side elevation of a looper embodying the invention. Fig. 2 is an edge view of the same looking in a direction opposite to the direction of feed. Fig. 3 is a similar view looking in the direction of feed. Fig. 4 is a bottom planview of the looper. Fig. 5 is a disassembled top planview of-the looper and Fig. 6 represents the sheet-metal blank from which the looper is made. i i

In the preferred embodiment of the in; Vention, as illustrated, a blank having the form illustrated in Fig. 6'is bent along the line 1 to form the fold'2 joining the ear sec;

beak and point"substantially"i'ir'a' plane p?-p ,parallel'to andsp'aced from the plane yfi-p of the ear section 3. It will be noted that the looper blank is formed with a slot 7 preferably of arcuate form, separating the blade portion 7 from the wing port on 3 and defining the form of the loop-seiz ng beak 8. The angular relation of the wlng and ear sections of the looper is preferably somewhat less than 90 in order that the line of fold 2 may be at the side ofand not coincident with the center of rotation of the looper-beak, whereby such center will fall upon the ear section 3 and may be marked with a centering aperture 10, Fig. 5. The

looper-shanks 11 may be inexpensively made fromordinary round stock on automatic screw machines and are ea,ch preferably formed with a disk-like head 12 the face of Which is perpendicular to the axis of the shank 11 and from the center of which face projects the centering pin 13. The looper and its shank may be quickly assembled and accurately centered relatively toone another by merely placing the pin 13 in the aperture'lO; said pin 13 preferably being subsequently swelled or headed over to hold the looper and shank in assembled relation. An additional fastening in the form of a rivet 14: or a spot weld may be made at a point spaced from the centering pin 13. The ear section 3adjoining the wing section insures not only the-correct and easy centering of the looper-blade but also the correct angular position of such blade relative to its axis of rotation. The shank 11 may be flattened, as at 15, for the end of the fastening screw 16 in the looper-supporting shaft 17, to insure correcttiming of the looper relative to the reciprocating needle n and other cooperative elements of the machine. Theouterradially disposed edge of the blade-section 7 is curved or formed with a clip 18 defining a throat 19 which serves to detain the outer limb of the needle-loop 2O as'the looper-beak is seizing the new needleloop 21. By relatively bei'iding the ear and wing sections?) and a, respectively, so that their angular relation to one another is less than 90, the loop-controlling throat 19 is carriedto a position approximately below the center of rotation of the looper when the looper-beak is in loop-seizing position, Fig. 1. This position of the throat 19 below the center 13, when the beak 8 is seizing a needleloop, insures that the throat will, at that time, be moving along the bottom of its circular path or substantially only horizontally or parallel to the work w, and will therefore not slacken the previous needleloop 20 until the looper-beak has turned a substantial angle beyond loop-seizing position and has seized the loop 21 and passed safely into the previous loop 20. 7

Having thus set forth the nature of the invention, what I claim herein is 1. A rotary chain-stitch looper comprising a body fashioned from a sheet-metal blank and shaped and bent to form a loopseizing beak, a loop-spreading wing, and an ear adjoining said wing and disposed substantially parallel to and spaced from the plane of actionof the loop-seizing beak, a shank element formed separately from the looper-body and adapted to be detachably secured to the looper-shaft of asewing machine, and means for securing said ear to said shank element.

2. A rotary chain-stitch looper comprising a body fashioned from a sheet-metal blank and shaped and bent to form a loop-seizing beak, a loop-spreading wing, and an ear adjoining said wing and disposed substantially parallel to and spaced from the plane of action of the loop-seizing beak, a cylindrical shank element adapted to be detachably secured to the socketed end of the looper-shaft of a sewing machine, and means for securing said ear flatwise upon the end of said shank element.

- 3. A rotary chain-stitch looper comprising a body fashioned from a sheet-metal blank ing the looper and shank element;

4. A rotary chain-stitch looper comprising a body fashioned from a sheet-metal blank and having a loop-seizing beak, a loop.-

spreading wing and an ear adjoining said wing, said ear and wing being relatively bent to stand at an angle of less than 90 to one another, substantially as and for the purposes specified.

5. A rotary chain-stitch looper comprising a body fashioned from a sheet-metal blank and having a loop-seizing beak, a loop spreading wing and an earbent out of the a plane of said wing and disposed substantially parallel to the plane of action of said loop-seizing beak.

6. A sheet-metal) rotary chain-stitch looper blank having blade, wing and ear portions, the blade and ear portions'being se arated by an arcuate slot extending inward y from the edge of said blank, and the blade portion being formed with loop-seizing and let off points. a

7 A sewing machine looper of the rotary chain-stitch type comprising, a shank formed at one end with a flange and a centering pin extending centrally of and beyond the face of said flange, and a looper body fashioned froma sheet-metal blank and having blade and wing portions and an apertured ear portion standing at an angle to the wing portion and entered by said centering pin.

a turned shank adapted to be detachably into a plane substantially parallel With the secured to the looper-shaft of a sewing maplane of the path of movement of the loopchine and formed at one end With a flange, seizing beak, and means for securing said and a looper body formed of sheet-metal and extension to the face of said flange.

having a loop-seizing beak and a loop- In testimony whereof, I have signed my spreading Wing, said Wing having an extenname to this specification.

sion bent out of the plane of the Wing and ALFRED GRIEB. 

